Promise.resolve().then(() => {
    console.log(0);
    return Promise.resolve(4)
}).then(res => {
    console.log(res);
    // console.log(4);
})

Promise.resolve().then(() => {
    console.log(1);
}).then(() => {
    console.log(2);
}).then(() => {
    console.log(3);
}).then(() => {
    console.log(5);
}).then(() => {
    console.log(6);
})